【开发日记】搭建日志系统LPG（Loki+Promtail+Grafana）时Loki容器报错：creating WAL folder at “/wal“: mkdir wal: permission

【问题】

使用Docker搭建日志系统LPG（Loki+Promtail+Grafana）时Loki容器报错：creating WAL folder at "/wal": mkdir wal: permission

【解决】

在Loki默认配置文件中加入以下内容：

ingester:
  wal:
    dir: /loki/.cache/loki/wal/

【完整的配置文件】

完整的 loki.yml：

auth_enabled: false
 
server:
  http_listen_port: 3100
 
ingester:
  lifecycler:
    address: 127.0.0.1
    ring:
      kvstore:
        store: inmemory
      replication_factor: 1
    final_sleep: 0s
  chunk_idle_period: 1h       # Any chunk not receiving new logs in this time will be flushed
  max_chunk_age: 1h           # All chunks will be flushed when they hit this age, default is 1h
  chunk_target_size: 1048576  # Loki will attempt to build chunks up to 1.5MB, flushing first if chunk_idle_period or max_chunk_age is reached first
  chunk_retain_period: 30s    # Must be greater than index read cache TTL if using an index cache (Default index read cache TTL is 5m)
  max_transfer_retries: 0     # Chunk transfers disabled
  wal:
    dir: /loki/.cache/loki/wal/
 
schema_config:
  configs:
    - from: 2020-10-24
      store: boltdb-shipper
      object_store: filesystem
      schema: v11
      index:
        prefix: index_
        period: 24h
 
storage_config:
  boltdb_shipper:
    active_index_directory: /loki/boltdb-shipper-active
    cache_location: /loki/boltdb-shipper-cache
    cache_ttl: 24h         # Can be increased for faster performance over longer query periods, uses more disk space
    shared_store: filesystem
  filesystem:
    directory: /loki/chunks
 
compactor:
  working_directory: /loki/boltdb-shipper-compactor
  shared_store: filesystem
 
limits_config:
  reject_old_samples: true
  reject_old_samples_max_age: 168h
 
chunk_store_config:
  max_look_back_period: 0s
 
table_manager:
  retention_deletes_enabled: false
  retention_period: 0s
 
ruler:
  storage:
    type: local
    local:
      directory: /loki/rules
  rule_path: /loki/rules-temp
  alertmanager_url: http://localhost:9093
  ring:
    kvstore:
      store: inmemory
  enable_api: true

完整的docker-compose.yml：

version: "3"

services:
  # 日志存储和解析
  loki:
    image: grafana/loki
    container_name: lpg-loki
    privileged: true
    volumes:
      - D:\erfan\app\LPG\loki:/etc/loki/
    # 修改loki默认配置文件路径
    command: -config.file=/etc/loki/loki.yml
    ports:
      - 3100:3100

  # 日志收集器
  promtail:
    image: grafana/promtail
    container_name: lpg-promtail
    privileged: true
    volumes:
      # 将需要收集的日志所在目录挂载到promtail容器中
      - D:\erfan\app\LPG\logs\:/var/log/
      - D:\erfan\app\LPG\promtail\:/etc/promtail/
    # 修改promtail默认配置文件路径
    command: -config.file=/etc/promtail/promtail.yml

  # 日志可视化
  grafana:
    image: grafana/grafana
    container_name: lpg-grafana
    privileged: true
    ports:
      - 3000:3000

完整的promtail.yml：

server:
  http_listen_port: 9080
  grpc_listen_port: 0

positions:
  filename: /tmp/positions.yaml

clients:
  - url: http://loki:3100/loki/api/v1/push

scrape_configs:
- job_name: system
  static_configs:
  - targets:
      - localhost
    labels:
      job: varlogs
      __path__: /var/log/*log